Shredder-cylinder.



C. L. JOHNSON.

SHREDDER CYLINDER.

APPLICATION FILED DEC. 5. 1914.

Patented Aug. 17, 1915.

3 SHEETS-SHEET l.

w/ r/vsssEs C. L. JOHNSON.

SHREDDER CYLINDER.

APPLICATION FILED DEC. 5. 1914.

1,150,198. Patented Aug. 17,1915.

3 SHEETS-SHEET 2.

WI TNESSES nvvslvraw' Q [HARLES L. JZ7/1/V5L7/V COLUMBIA PLANOGRAPH co.,WAsI-I|NGTON.,IJ. g.

C. L. JOHNSON.

SHREDDER CYLINDER. APPLICATION FILED DEC. 5. 1914.

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' Patented Aug. 17, 1915.

3 SHEETS-SHEET 3- W/r/VE55E5 v l/VVF/VTUF Q A EHAA'LES' L. Ja/wvso/v made duplicate parts NITE srarns PATENT CHARLES :13. JoHNsomoF sAN FRANCISCO, CALIFORNIA.

' sHnEnnER-oYLmnEn.

To all whom itmag concern: i a Be it known that 1, CHARLES L. JOHNSON, a. citizen of the United States, residing at San F rancisco,inthe county of San Francisco, State of California, have invented a new and useful Shredder-Cylinder, of which the following is a specificationin such full and clear terms as will enable those skilled inthe art to construct and use thesame.

This invention relates to a resilient strain distributing vmultidentate shredding cylinder. a

An object of the invention is to produce such a cylinder by the use-ofa few easily This object is attainedby a multiple arrangement of a pluralityj of sets of interchangeable parts arranged around a central .axis inalternating courses or layers of spacing parts and toothed segments, each spacing course breaks ing joints with the preceding spacingcourse.

Each course oftoothedsegmentsis omitted at every other section said omissions being fillediwith a spacingwasherof suitable thickness,"said washers being opposite a toothed segment in each preceding course or layer of toothedsegments and thereby with a series of bolts forming a complete cylinder of con nected chainsior bands. A i j Another object of the invention is to provide a cylinder. which 1 will ,be easily renewed when one set ofiteeth' is injured or worn out. 1 Another object is to make a cylinder capableof expanding under. changes in temperature and highspeed. 1 v r U A further object of the invention is to produce a resilient shock absorbing cylinder which will provide in a cheap practical manner the maximum elasticity when subjected to shocks and whichreadily distributes them equally in all directions around and through the cylinder. 1 I j -1 attain these objects by the multiple ar rangement of joints, spaces and duplicate washers and parts and saw steel toothed segments forming the connecting links of the 7 Specification of Letters Patent. Pa'fiented Aug 1'1, 1,915, Application filed December 5, 1914. Serial No. 875,736.

der with portions thereof broken'away for purposes of illustration, Fig. 2 is a front elevation of the shredder with a portion of the toothed concave and af portion of the guard concave broken away for purposes of 1llustrat1on, Fig. 3 is a plan view of one of the cylinder side pieces, Fig. 4 is a plan view of one of the concave members, Fig. 5 is a plan v1ew of a form of core which can be used if lt is desired to build the cylinder on acore of wood or metal, Fig. 6 isa plan View of one of the main segmentalspacers used in the construction of the cylinder when made of wood or metal, Fig. 7 is a plan view of oneof the toothed steel segments, Fig. 8 1s a plan view of one of the concave steel segments carrying three teeth,' ,and Fig. 9 is a plan v1ew of one of the concave steel segments carrying two teeth.

lhe shredder is mounted upon two sills 1 and 2 .wh chsills support'two wide posts 3 and two longer and narrower posts A. The posts carry supports 5 and 6. for the shredder cylinder'and supports 7 and 8 forthe toothed concave, as well as supports9 and 10 for the guard concave at the bottom of the cylinder. The'supports just mentioned all extend from the posts 3 and posts land are suitably bolted thereto, while at the front of the machine there is a table 12 having hopper sides 13 toassist the workmen in feeding the material into the shredder. The table also acts as a longitudinal brace by being secured to the posts 3 and to the supports 5 and 6. The supports, 5 and 6 carry suitable boxes 14, one at each end of the shredder cylinder 15 for the support of the same. Adjacent thefront of the machine the supports 5 and 6carry boXes 16, one at each end for the support of the feed roll 17. Adjacent the bottom at the front of the machine there are two levers 18 pivoted to the two posts 3 at 19, which levers support bearing boxes-20 for the lower feed rollZl. A spring 22 pulls down on each of the leverslS and holds the lower roll against the material being fed into the machine with sufficient pressure to. prevent it from being dragged thereinto Icy-the shredder cylinder too rapidly and at the same time it is fed forward as rapidly as may be required. V The guard concave comprises a plurality of flat boards or plates 23 mounted on the supports 9 and 10 in such proximity to the shredding cylinder as will cause the cylinder to draw all of the shredded material not thrown clear thereof back into the machine again. a v The cylinder may be made of wood spacers between which are a series of steel toothed geared as to have a peripheral speed of from 4500 to 5000 feet per minute. The cylinder is made up of four flat semi-circular end pieces 26, two metal fiang'es 27 through which bolts pass" to connect the end pieces and core pieces with the shaft, a plurality of spacers 27, a plurality of toothed plates 28, a plurality of washers 29 and a plurality of bolts 30. p

In the construction of the cylinder one of the metal flanges 27 is; placed on the shaft 24 two of the. semi-circular end pieces 26' are then secured tothe inside of one of the metal flanges27 by means of the four flanged bolts which extend clear through the core pieces," after which the sixteen circumferen tial boltsare placed in position in the end pieces. The bolts 33 extend longitudinally of the cylinder and serve to connect the several parts thereof together. Four of the spacers 27 are next-assembled on the bolts adjacent the assembled end pieces after which four of the toothed plates are assembled upon-the'bolts" in-such a manner asto break joints across theends of the spacers, note-Fig. 1, a washer of the same thickness as the toothed segments is then placed on each of the remaining bolts, whereupon a series of spacing plates 27' is assembled in such a manner asto have itsjoint's come in the middle of the next adj acent spacers; whereupon another set of toothedplates and washers. are assembled upon the bolts in such a manner as to cause the toothed plates to overlie the ends of the next adjacent spacers.

The assembly ,is' continued until the entire cylinder iscompleted, the last course being a set of spacing plates 27, whereupon two additional semi-circular plates, 26 are put in position on the bolts and the remaining metal flange 27 is then secured in place outside the plates 26." The nuts are then placed upon the bolts and the entire cylinder is drawn together tight to an even thickness by means 7 of the bolts.

' The toothed concave is made up of one or more sections and 13, each identical with the other in construction. The concave is made of a plurality of parts 40 of the shape illustratedin Fig. 4 so that a description of only'jone concave will be given. Bolts 41 extend entirely through the machine and support the concaves, there being two bolts toeachlpart A and B. Each concave has a wide part 44 and'46 which parts are connected to the remaining segments 40by means of a plurality of bolts 43. The parts 44 and 4.6 are of sucha width'as to just bring the first toothed plates28 and 28 in the middle cylinder and the first series of toothed plates 28 carried thereby. .7

The concave is assembled by passing the bolts 43 through one 'of the parts 44 or 46 after which the toothed segments 28 'and28 of the spacebetween the end pieces of the and washers W areassembled thereon to- V.

gether with the members 40, the toothed segments and members '40 being alternated while' the toothed segments are alternated in position as indicated in Fig. .4; After all of. the spacers, toothed segments and washers have been assembled they are secured together bytightening the nuts down on said bolts and drawing the concave. down to an even thickness corresponding with the spacing of'the toothed plates of the cylinder. The concaves are secured to the machineby insertingthe bolts 4l through the'parts and S and through corresponding holes in the concaves. g

' The advantages of the construction shown lies in thefa'ct that each plate can'be made of tempered saw 1 steel and carries a plurality of teeth which adds greatly to the strength and durability of the shredding points. Themultiplicity of parts makes the pansion due to high speed andcha nges temperature. The sectional and segmental construction, of theconcave providesfor a delicate uniform and proper adjustment of the concave. to the cylinder in longitudinal the bolts being tightened to suit: ,l Having thus described my invention what positioning of the teeth on said two parts,

I claim as new and desire to secure by'Letters Patent of the United States, is as follows, modifications within the scope'of the claims being expressly reservedr p 1 1. A shredder cylinder. comprising a shaft, semi-circular end pieces a. plurality of segmental spacers, circumferentially-longitudinally extending'bolts, and a plurality of toothed plates assembled side by side,

adjacent pair of segments. 7 or .2. A shredder cylinder comprising a shaftgcircular end pieces on said;shaft,' a plurality V of bolts extending longitudinally ofsaid cylinder adjacentthe circumference each toothed plate breaking joints with an copies of this patent may be obtained for thereof, and a plurality of short toothed plates mounted on said bolts adjacent the segmental spacers,the plates breaking joints with an adjacent spacer.

3. In a shredder cylinder, the combination of a shaft, circular end pieces therein, a plurality of segmental spacers, a plurality of bolts extending through .said circular pieces an'd'through said segmental pieces adjacent the periphery of the cylinder, a plurality of toothed plates, and bolts adjacent the spacers and breaking joints With an adj acent spacer, said plates being soarranged so that two adjacent roWs thereof with. the

bolts passing through them form a complete chain around the cylinder. g

4. In a shredder cylinder, the combination of a shaft, a core mounted thereon, circular end pieces, a plurality ofsegmental spacers, bolts extending through said segmental spacers and the end pieces, and a plurality of toothed plates between the series of spacers, the spacers being arranged to break joints With ad acent spacers and the toothed plates to break joints With the spacers adjacent them.

j 5. A concave for shredders comprising a plurality of spacing segments, a plurality of toothed segments between the spacing In testimony whereof I have hereunto set I my hand this 7 day of November, A. D. 1914, in the presence of the two subscribed witnesses.

CHARLES L. JOHNSON.

Witnesses:

G. P. GRIFFIN, L. H. ANDERSON.

five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

